import pytest
import torch
from types import SimpleNamespace
from cognitive_mapping_probe.llm_iface import LLM

@pytest.fixture(scope="session")
def mock_llm_config():
    """Stellt eine minimale, Schein-Konfiguration für das LLM bereit."""
    return SimpleNamespace(
        hidden_size=128,
        num_hidden_layers=2,
        num_attention_heads=4
    )

@pytest.fixture
def mock_llm(mocker, mock_llm_config):
    """
    Erstellt einen robusten "Mock-LLM" für Unit-Tests.
    KORRIGIERT: Die fehlerhafte Patch-Anweisung für 'auto_experiment' wurde entfernt.
    """
    mock_tokenizer = mocker.MagicMock()
    mock_tokenizer.eos_token_id = 1
    mock_tokenizer.decode.return_value = "mocked text"

    def mock_model_forward(*args, **kwargs):
        batch_size = 1
        seq_len = 1
        if 'input_ids' in kwargs and kwargs['input_ids'] is not None:
            seq_len = kwargs['input_ids'].shape[1]
        elif 'past_key_values' in kwargs and kwargs['past_key_values'] is not None:
            seq_len = kwargs['past_key_values'][0][0].shape[-2] + 1

        mock_outputs = {
            "hidden_states": tuple([torch.randn(batch_size, seq_len, mock_llm_config.hidden_size) for _ in range(mock_llm_config.num_hidden_layers + 1)]),
            "past_key_values": tuple([(torch.randn(batch_size, mock_llm_config.num_attention_heads, seq_len, 16), torch.randn(batch_size, mock_llm_config.num_attention_heads, seq_len, 16)) for _ in range(mock_llm_config.num_hidden_layers)]),
            "logits": torch.randn(batch_size, seq_len, 32000)
        }
        return SimpleNamespace(**mock_outputs)

    llm_instance = LLM.__new__(LLM)

    llm_instance.model = mocker.MagicMock(side_effect=mock_model_forward)

    llm_instance.model.config = mock_llm_config
    llm_instance.model.device = 'cpu'
    llm_instance.model.dtype = torch.float32

    mock_layer = mocker.MagicMock()
    mock_layer.register_forward_pre_hook.return_value = mocker.MagicMock()
    llm_instance.model.model = SimpleNamespace(layers=[mock_layer] * mock_llm_config.num_hidden_layers)

    llm_instance.model.lm_head = mocker.MagicMock(return_value=torch.randn(1, 32000))

    llm_instance.tokenizer = mock_tokenizer
    llm_instance.config = mock_llm_config
    llm_instance.seed = 42
    llm_instance.set_all_seeds = mocker.MagicMock()

    # Patch an allen Stellen, an denen das Modell tatsächlich geladen wird.
    mocker.patch('cognitive_mapping_probe.llm_iface.get_or_load_model', return_value=llm_instance)
    mocker.patch('cognitive_mapping_probe.orchestrator_seismograph.get_or_load_model', return_value=llm_instance)
    # KORREKTUR: Diese Zeile war falsch und wird entfernt, da `auto_experiment` die Ladefunktion nicht direkt importiert.
    # mocker.patch('cognitive_mapping_probe.auto_experiment.get_or_load_model', return_value=llm_instance)
    mocker.patch('cognitive_mapping_probe.concepts.get_concept_vector', return_value=torch.randn(mock_llm_config.hidden_size))

    return llm_instance